// vararr2d.c -- functions using VLAs
#include <stdio.h>
#define ROWS 3
#define COLS 4
int sum2d(int rows, int cols, int ar[rows][cols]);
int main(void) {
  int i, j;
  int rs = 3;
  int cs = 10;
  int junk[ROWS][COLS] = {{2, 4, 6, 8}, {3, 5, 7, 9}, {12, 10, 8, 6}};

  int morejunks[ROWS - 1][COLS + 2] = {{20, 30, 40, 50, 60, 70},
                                       {5, 6, 7, 8, 9, 10}};

  int varr[rs][cs];  // VLA
  for (i = 0; i < rs; i++) {
    for (j = 0; j < cs; j++) {
      varr[i][j] = i * j + j;
    }
  }

  printf("3x5 array\n");
  printf("Sum of all elements = %d\n", sum2d(ROWS, COLS, junk));

  printf("2x6 array\n");
  printf("Sum of all elements = %d\n", sum2d(ROWS - 1, COLS + 2, morejunks));

  printf("3x10 VLA\n");
  printf("Sum of all elements = %d\n", sum2d(rs, cs, varr));

  return 0;
}

// function with a VLA parameter
int sum2d(int rows, int cols, int ar[rows][cols]) {
  int r, c, tot = 0;

  for (r = 0; r < rows; r++) {
    for (c = 0; c < cols; c++) {
      tot += ar[r][c];
    }
  }

  return tot;
}